The Alabama senator has been a strong advocate for overhauling immigration laws.

In a February speech to the National Association of Attorneys General, Sessions said he believes “there is nothing wrong, legally, morally or intellectually, with a lawful system of immigration that serves the national interest. What’s wrong with that?”

“People who come here unlawfully, who commit crimes, are going to be out of here,” Sessions said in his speech. “The law says that they have to be deported and we’re going to insist that that happens.”

The U.S.-Mexico border has been a hot topic during President Donald Trump’s administration so far, after he signed an executive order in January ordering construction of a border wall.

Plans for the wall were advanced shortly after, when Department of Homeland Security Secretary John Kelly signed two directives relating to immigration calling on Customs and Border Protection to “immediately begin planning, design, construction and maintenance of a wall.”

The plans for the U.S.-Mexico border wall took off recently after various companies submitted proposals to the government. A Scottsdale-based company said its border wall would be immune to both tampering and attacks.